Japan is in the midst of a "Bootcamp" craze that swept through the US a couple of years ago.

Neatorama reader Gaijin-san wrote:

Japan has discovered exercise guru Billy Blanks and is in the midst of a "Billy's Bootcamp" craze. Billy is trying to fill his pockets with as much cash as he can get out of his fad-like popularity in Japan, even releasing a "rap" song called BOOM BOOM WONDERLAND.